Device for detecting expansion force of battery cell

Abstract

The utility model discloses a device for detecting the expansion force of a battery cell. The device comprises a bottom plate, a pressure sensor, a sliding plate, a top plate and the battery cell, a plurality of sliding columns are vertically arranged on the bottom plate, external threads are arranged at the top ends of the sliding columns, and the pressure sensor is arranged on the bottom plate. The sliding plate is provided with a first through hole, and the sliding plate is slidably installed on the sliding column. The top plate is provided with second through holes corresponding to the sliding columns, the top plate is installed on the sliding columns in a sliding mode, and the top plate is parallel to the sliding plate. The battery cell is placed between the sliding plate and the top plate, nuts are screwed on the external threads of the sliding columns, the nuts are screwed to press down the top plate to enable the upper and lower surfaces of the battery cell to abut against the sliding plate and the top plate respectively, and the top end of the pressure sensor abuts against the bottom of the sliding plate. The device provided by the utility model can monitor the whole-course data of the expansion size of the cell life cycle test, and can be used for testing cells with different specifications and sizes.

Description

Technical Field

[0001] The utility model belongs to the technical field of new energy battery testing, and particularly relates to a device for detecting the expansion force of a battery core. Background Art

[0002] When the battery cell is charged, lithium ions are released from the positive electrode and embedded in the negative electrode, causing the distance between the negative electrode layers to increase, resulting in expansion. The thicker the battery cell, the greater the expansion. If the battery design is unreasonable or there are defects in the manufacturing process, the pressure inside the battery may not be effectively released, causing the battery cell to expand.

[0003] During the battery cell cycle life test, the battery cell needs to be repeatedly charged and discharged. In order to study the capacity loss of the battery cell, it is necessary to detect the degree of expansion of the battery cell during the full life cycle test.

[0004] Therefore, the use of a device to detect the degree of expansion of the battery cell is essential to ensure the performance and safety of the battery cell. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a device for detecting the expansion force of a battery cell, comprising a bottom plate, a pressure sensor, a sliding plate, a top plate and a battery cell.

[0006] The bottom plate is rectangular, and a plurality of sliding columns are vertically arranged at its four corners. The top ends of the sliding columns are provided with external threads, and the pressure sensor is arranged on the bottom plate.

[0007] Furthermore, the sliding columns are provided in four groups and arranged in a rectangular shape.

[0008] Furthermore, the bottom of the base plate is provided with base plate reinforcing ribs.

[0009] Furthermore, the bottom plate is provided with three sensor positioning holes, and the pressure sensor is screwed and fixed on the bottom plate through the sensor positioning holes.

[0010] The sliding plate is rectangular, and its four corners are provided with first through holes corresponding to the sliding posts. The first through holes pass through the sliding posts. The sliding plate is slidably mounted on the sliding posts, and the sliding plate is parallel to the bottom plate.

[0011] The top plate is rectangular, and its four corners are provided with second through holes corresponding to the sliding posts. The second through holes pass through the sliding posts. The top plate is slidably mounted on the sliding posts, and the top plate is parallel to the sliding plate.

[0012] Furthermore, a top plate reinforcing rib is provided at the bottom of the top plate.

[0013] The battery cell is placed between the sliding plate and the top plate, and nuts are screwed on the external threads of the sliding column. The nuts are screwed in to press down the top plate so that the upper and lower surfaces of the battery cell respectively abut against the sliding plate and the top plate, and the top end of the pressure sensor abuts against the bottom of the sliding plate.

[0014] The utility model provides a device for detecting the expansion force of a battery cell, which can monitor the full-process data of the expansion size of the battery cell life cycle test and can be used to test battery cells of different specifications and sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a schematic diagram of the appearance structure of a device for detecting the expansion force of a battery cell according to the utility model;

[0017] Figure 2 It is a front view schematic diagram of a device for detecting the expansion force of a battery cell according to the utility model;

[0018] Figure 3 This is a schematic diagram of a bottom plate of a device for detecting the expansion force of a battery cell according to the utility model;

[0019] Figure 4 The utility model is a schematic diagram of a top plate of a device for detecting the expansion force of a battery cell.

[0020] Explanation of the reference numerals in the figure: 1. bottom plate, 101. sliding column, 102. bottom plate reinforcement rib, 103. sensor positioning hole, 2. pressure sensor, 3. sliding plate, 301. first through hole, 4. top plate, 401. second through hole, 402. top plate reinforcement rib, 5. battery cell, 6. nut. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, an embodiment of the utility model is a device for detecting the expansion force of a battery cell, comprising a bottom plate 1, a pressure sensor 2, a sliding plate 3, a top plate 4 and a battery cell 5.

[0024] The bottom plate 1 is rectangular, and a plurality of slide posts 101 are vertically arranged at four corners thereof. The top ends of the slide posts 101 are provided with external threads, and the pressure sensor 2 is arranged on the bottom plate 1 .

[0025] Preferably, the sliding posts 101 are provided in four groups and arranged in a rectangular shape.

[0026] Preferably, a bottom plate reinforcing rib 102 is provided at the bottom of the bottom plate 1, and the bottom plate reinforcing rib 102 can reduce the deformation of the bottom plate 1 when it is under pressure.

[0027] Preferably, three sensor positioning holes 103 are provided on the bottom plate 1, and the pressure sensor 2 is screwed and fixed on the bottom plate 1 through the sensor positioning holes 103. The pressure sensor 2 is completely fixed to prevent displacement after being compressed, so that the obtained data is more accurate.

[0028] The sliding plate 3 is rectangular, and its four corners are provided with first through holes 301 corresponding to the sliding posts 101 . The first through holes 301 pass through the sliding posts 101 . The sliding plate 3 is slidably mounted on the sliding posts 101 , and the sliding plate 3 is parallel to the bottom plate 1 .

[0029] The top plate 4 is rectangular, and has four corners with second through holes 401 corresponding to the sliding column 101 . The second through holes 401 pass through the sliding column 101 . The top plate 4 is slidably mounted on the sliding column 101 , and the top plate 4 is parallel to the sliding plate 3 .

[0030] Preferably, a top plate reinforcing rib 402 is provided at the bottom of the top plate 4, and the top plate reinforcing rib 402 can reduce the deformation of the top plate 4 when it is under pressure.

[0031] The battery cell 5 is placed between the sliding plate 3 and the top plate 4. The external threads of the sliding column 101 are all screwed with nuts 6. The nuts 6 can be adjusted to adapt to the sizes of battery packs of various models. The nuts 6 are screwed into the top plate 4 to press down so that the upper and lower surfaces of the battery cell 5 abut against the sliding plate 3 and the top plate 4 respectively. The top of the pressure sensor 2 abuts against the bottom of the sliding plate 3. The battery cell squeezes the sliding plate 3 through the force generated by bulging and expansion. The pressure sensor monitors the force of the sliding plate 3 squeezing the sensor and outputs data through the pressure sensor.

[0032] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A device for detecting the expansion force of a battery cell, characterized in that: It comprises a bottom plate (1), a pressure sensor (2), a sliding plate (3), a top plate (4) and a battery cell (5); The bottom plate (1) is rectangular, and a plurality of sliding columns (101) are vertically arranged at its four corners. The top ends of the sliding columns (101) are provided with external threads. The pressure sensor (2) is arranged on the bottom plate (1); The sliding plate (3) is rectangular, and its four corners are provided with first through holes (301) corresponding to the sliding column (101), the first through holes (301) pass through the sliding column (101), the sliding plate (3) is slidably mounted on the sliding column (101), and the sliding plate (3) is parallel to the bottom plate (1); The top plate (4) is rectangular, and has four corners provided with second through holes (401) corresponding to the sliding column (101), the second through holes (401) passing through the sliding column (101), the top plate (4) is slidably mounted on the sliding column (101), and the top plate (4) is parallel to the sliding plate (3); The battery cell (5) is placed between the sliding plate (3) and the top plate (4); nuts (6) are screwed onto the external threads of the sliding column (101); the nuts (6) are screwed into and press down the top plate (4) so ​​that the upper and lower surfaces of the battery cell (5) respectively abut against the sliding plate (3) and the top plate (4); and the top end of the pressure sensor (2) abuts against the bottom of the sliding plate (3).

2. A device for detecting the expansion force of a battery cell according to claim 1, characterized in that: The sliding columns (101) are in four groups and arranged in a rectangular shape.

3. A device for detecting the expansion force of a battery cell according to claim 1, characterized in that: The bottom of the bottom plate (1) is provided with bottom plate reinforcing ribs (102).

4. A device for detecting expansion force of a battery cell according to claim 1, characterized in that: The bottom plate (1) is provided with three sensor positioning holes (103), and the pressure sensor (2) is screwed and fixed on the bottom plate (1) through the sensor positioning holes (103).

5. The device for detecting the expansion force of a battery cell according to claim 1, characterized in that: The bottom of the top plate (4) is provided with a top plate reinforcing rib (402).

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